Page 60
XP25
Reversing Valve Operation, Checkout and Status / Error Codes
OPERATION:
The reversing valve switches the system between cooling and heating modes. By switching the flow of refrigerant, the
heat pump can incorporate the functions of cooling in the summer and heating in the winter. The valve consists of a main
body and a solenoid coil.
Note - The reversing valve solenoid is energized in the cooling mode.
Figure 37. Reversing Valve (L1)
CHECKOUT:
Using a multimeter set to ohms, with the solenoid terminals disconnected from the outdoor unit’s control, check the
resistance between the two terminals of the reversing valve solenoid. If the resistance reading is 0 ohms or infinite,
replace solenoid coil.
Figure 38. Reversing Valve Checkout
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